I am going to instead present one piece of evidence that the earth's lower age limit is greater than 15,000 years, then, without invoking radiometric dating. This would effectively demonstrate that the earth is indeed at least this old. I recognize that this doesn't show the earth is 4.55 billion years old, but demonstrates that it is older than 6,000.
I don't think to many Creationist's are going to be upset if the earth was 10k, or even 15k years old..... Honestly, if it was even 100k years old I don't think too many people are going to keel over.
I humbly request that we carefully go over each piece of evidence individually before we move on to evidence of a young earth or more evidence of an old earth so as to honor the quality over quantity philosophy of this establishment.
The a sample taken from the core of Lake Suigetsu measuring 75 meters deep reveals over 60,000 alternating layers; dark and light. The light layers have been observed to form annually due to Spring diatom growth. That is all.
1st off, don't you think it would be pretty amazing that the conditions in that lake remained constant for 70k years?
2nd, you simply don't know what it was like 5000 years ago, and there may have been condistions where the plants blossomed 5 or 6 times a year, and now they only blossom once a year.
So, we really just don't know, but you certainly connot claim any date based on the formation rates of the varves today. You can just say that if things have been the same for so many years then that lake is such and such old, But its still an if, maybe it is, maybe it isnt.
Finally, Guy Berthault has done some experimention shown that you can create these types of sediments with flowing water.
SEDIMENTOLOGY—Experiments on lamination of sediments, resulting from a periodic graded-bedding subsequent to deposition—a contribution to the explanation of lamination of various sediments and sedimentary rocks.
These sedimentation experiments have been conducted in still water with a continuous supply of heterogranular material. A deposit is obtained, giving the illusion of successive beds or laminae. These laminae are the result of a spontaneous, periodic and continuous grading process, which takes place immediately, following the deposition of the heterogranular mixture.
The thickness of the laminae appears to be independent of the speed of sedimentation but increases with extreme differences in the size of the particles in the mixture. Where a horizontal current is involved, thin laminated superposed layers developing laterally in the direction of the current, are observed.
The mixture was fed from the distributor into the test tube of water at three successive speeds of 50, 100 and 150g per hour for identical periods of time. Lamination appeared in the deposit and the thickness did not vary with the sedimentation speed. The original lamination was reproduced with virtually the same thickness (see Figure 6).
You can read about that here:
Lamination with water flow